| /****************************************************************************** |
| * |
| * Copyright (C) 2014 Google, Inc. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at: |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| ******************************************************************************/ |
| |
| #pragma once |
| |
| #include <hardware/bluetooth.h> |
| #include <stdbool.h> |
| #include <stdint.h> |
| |
| typedef struct buffer_t buffer_t; |
| typedef struct l2cap_client_t l2cap_client_t; |
| |
| typedef struct { |
| void (*connected)(l2cap_client_t *client, void *context); |
| void (*disconnected)(l2cap_client_t *client, void *context); |
| void (*read_ready)(l2cap_client_t *client, buffer_t *packet, void *context); |
| void (*write_ready)(l2cap_client_t *client, void *context); |
| } l2cap_client_callbacks_t; |
| |
| // Returns a new buffer with enough space for |size| bytes of L2CAP payload. |
| // |size| must be greater than zero. This function returns NULL if the buffer |
| // could not be allocated. The returned buffer must be freed with |buffer_free| |
| // when it is no longer needed. |
| buffer_t *l2cap_buffer_new(size_t size); |
| |
| // Creates and returns a new L2CAP client object. |callbacks| must not be NULL and |
| // must specify a set of functions that should be called back when events occur |
| // on the L2CAP connection. |context| may be NULL and will be passed as the argument |
| // to all callbacks in |l2cap_client_callbacks_t|. The returned object must be freed |
| // with |l2cap_client_free|. |
| l2cap_client_t *l2cap_client_new(const l2cap_client_callbacks_t *callbacks, void *context); |
| |
| // Frees the L2CAP client object allocated with |l2cap_client_new|. |client| may be NULL. |
| void l2cap_client_free(l2cap_client_t *client); |
| |
| // Attempts to connect the |client| to a peer device specified by |remote_bdaddr| |
| // using the |psm| protocol specifier. This function returns true if the connect |
| // operation could be started and will indicate completion with either a 'connected' |
| // callback (success) or a 'disconnected' callback (failure). |
| // |
| // This function must not be called while a connect operation is in progress or |
| // while |l2cap_client_is_connected|. |client| and |remote_bdaddr| must not be NULL. |
| // |psm| must be greater than zero. |
| bool l2cap_client_connect(l2cap_client_t *client, const bt_bdaddr_t *remote_bdaddr, uint16_t psm); |
| |
| // Disconnects a connected |client|. This function is asynchronous and idempotent. It |
| // will indicate completion with a 'disconnected' callback. |client| must not be NULL. |
| void l2cap_client_disconnect(l2cap_client_t *client); |
| |
| // Returns true if |client| is connected and is ready to accept data written to it. |
| // |client| must not be NULL. |
| bool l2cap_client_is_connected(const l2cap_client_t *client); |
| |
| // Writes data contained in |packet| to a connected |client|. This function returns |
| // true if the packet was successfully queued for delivery, false if the client cannot |
| // accept more data at this time. If this function returns false, the caller must wait |
| // for the 'write_ready' callback to write additional data to the client. Neither |
| // |client| nor |packet| may be NULL. |
| bool l2cap_client_write(l2cap_client_t *client, buffer_t *packet); |